<template>
    <div>
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <el-card>
            <el-row>
                <el-col>
                    <el-button>添加角色</el-button>
                </el-col>
            </el-row>
        <el-table :data="rolelist" border stripe>
            <!--展开列-->
            <el-table-column type="expand">
                <template slot-scope="scope">
                    <el-row :class="['bdbottom', i1 === 0 ? 'bdtop':'','vcenter']" v-for="(item1, i1) in scope.row.children" :key ="item1.id">
                        <!--渲染一级权限-->
                        <el-col :span="5" >
                            <el-tag closable @click="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                            <i class="el-icon-caret-right"></i>
                        </el-col>
                        <!--渲染二级权限-->
                        <el-col :span="19">
                            <!--通过for循环嵌套渲染二级权限-->
                            <el-row :class="['bdtop', i2 === 0 ? '':'bdtop', 'vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                                <el-col :span="6">
                                    <el-tag type='success' closable @click="removeRightById(scope.row, item2.id)" >{{item2.authName}}</el-tag>
                                    <i class="el-icon-caret-right"></i>
                                </el-col>
                                <!--通过for循环嵌套三级权限-->
                                <el-col :span="18">
                                    <el-tag type='warning' v-for="(item3,i3) in item2.children" :key="item3.id" closable @click="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                                </el-col>
                            </el-row>
                        </el-col>
                    </el-row>
                </template>
            </el-table-column>

            <el-table-column type="index"></el-table-column>
            <el-table-column label="角色名称" prop="roleName"></el-table-column>
            <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
            <el-table-column label="操作" width="300px">
                <template slot-scope="scope">
                    <el-button size='mini' type="primary" icon="el-icon-edit">编辑</el-button>
                    <el-button size='mini' type="danger" icon="el-icon-delete">删除</el-button>
                    <el-button size='mini' type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                </template>
            </el-table-column>
        </el-table>

        </el-card>
        <!--分配权限的对话框-->
        <el-dialog title="分配权限" :visible.sync="setRightDialogVisiable" width="50%" @close="setRightDialogClosed">
            <!--树形控件-->
            <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys='defKeys' ref="treeRef"></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisiable = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return{
        //所有角色列表
        rolelist:[],
        //控制分配权限对话框的显示与隐藏
        setRightDialogVisiable: false,
        //权限列表
        rightslist:[],
        //树形控件的属性绑定对象
        treeProps:{
            label:'authName',
            children: 'children'
        },
        //默认选中的节点值
        defKeys:[],
        // 当前即将分配权限的角色id
        roleId: ''
        }
    },
    created(){
        this.getRolesList()
    },
    methods:{
        //获取所有角色的列表
        async getRolesList(){
            const {data:res} = await this.$http.get('roles')
            if(res.meta.status !== 200){
                return this.$message.error("获取角色列表失败");
            }
            this.rolelist = res.data
            //console.log(this.rolelist)
        },
        //根据Id删除对应的权限
        async removeRightById(role,rightId){
            const comfireResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)

            if(comfireResult !== 'confirm'){
                return this.$message.info('取消删除')
            }
            const {data:res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if(res.meta.status !== 200){
                return this.$message.error('删除权限失败')
            }
            //this.getRolesList()
            role.children = res.data
        },
        //展示分配权限的对话框
        async showSetRightDialog(role){
            this.roleId = role.id
            //获取所有权限的数据
            const {data: res}= await this.$http.get('rights/tree')
            if (res.meta.status !== 200) {
                return this.$message.error('获取权限数据失败')
            }
            //把获取到的权限数据保存到data中
            this.rightslist = res.data

            //递归获取三级节点的ID
            this.getLeafKeys(role, this.defKeys)

            this.setRightDialogVisiable = true
        },
        //通过递归的形式，获取角色下所有三级权限的id,并保存到defkeys数组中
        getLeafKeys(node, arr){
            //如果当前node节点不包含children属性，则是三级节点
            if(!node.children){
                return arr.push(node.id)
            }
            node.children.forEach(item => 
                this.getLeafKeys(item, arr))
        },
        //监听分配权限对话框的关闭事件
        setRightDialogClosed(){
            this.defKeys = []
        },
        //点击为角色分配权限
        async allotRights(){
            const keys =[
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]
            const idStr = keys.join(',')

            const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})
        
            if(res.meta.status !== 200){
                return this.$message.error('分配权限失败')
            }
            this.$message.success('分配权限成功！')
            this.getRolesList()
            this.setRightDialogVisiable = false
        }
    }
}
</script>

<style lang="less" scoped>
.el-tag{
    margin: 7px;

}
.bdtop{
    border-top: 1px solid #eee;
}
.bdbottom{
    border-bottom: 1px solid #eee;
}
.vcenter{
    display: flex;
    align-items: center;
}
</style>